I bike commute to the subway generally everyday except blizzards or heavy freezes. Up until now, I've used an old North Face daypack I had to lug my suit, lunch, etc. This works ok, but I have to deal with some minor wrinkling. If anyone knows of a bag that can hold a suit with minimal wrinklage with room for other things (at minimum, lunch container, a couple of bike locks, cell phone/keys), please advise. I don't want the touring gear that rides on the bike; also, I hate the one shoulder-strap bike-messenger-style bags, so I would prefer a typical 2-shoulder strap bag.
Also, I'd appreciate anyone sharing their recommendations on commuting clothes, specifically winter gear. I have an old Performance jacket and matching hat. They are both waterproof and warm, but don't have any breathability (you can get just as wet under the jacket from sweat) and certainly lack any sense of style (20+ years old gear).